252 PROCEEDINGS OF THE ACADEMY OF [Mch., 



The fifteenth tooth has the mesocone bifid. As a rule, the marginal 

 teeth have the ectocone simple, but I found a few teeth in some rows 

 having a bifid ectocone. 

 Ashmunella ohirioahnana mogollonensis n. subsp. PI. XVI, figs. 101, 102. 



vSimilar to chiricahuana but slightly more tumid, dull greenish-brown, 

 not glossy. Surface sculptured with low, irregular, coaree wrinkles of 

 growth, and distinct, clear-cut incised spirals all over the last whorl. 

 Spire very low, the early whorls depressed. 



Alt. 9, diam. 17.5 mm. ; whorls 5^. 



West fork of the Gila river, near Mogollon Peak, in the southwestern 

 part of Socorro county. New Mexico, in a pine region, collected by Prof. 

 E. O. Wooton, August 7, 1900, sent by Prof. T. D. A. Cockerell. Type 

 No. 79,530, A. N. S. P. (fig. 102). A specimen has also been taken 

 by Mr. 0. B. Metcalfe near Kingston, Sierra county. New Mexico (fig. 

 101). 



In A . chiricahuana the spirals are very much weaker or obsolete, and 

 the cuticle, when in unworn condition, is conspicuously glossy. J 



Group of A. metamorphosa. 



Shell edentulous, similar to A. chiricahuana. Genitalia peculiar, see 

 below. 

 Ashmunella metamorphosa n. sp. PI. XVI, figs. 114, 115. 



Shell similar in form and color to A. chiricahunna and A. esuritor. 

 Surface slightly marked with growth-lines and very minutely engraved 

 spirally when unworn, but the spirals cannot be seen on slightly cor- 

 roded living shells. Whorls 5f to 6^, convex, slowly widening, the 

 last rounded peripherally, slightly descending in front, contracted 

 behind the reflexed and slightly recm'ved lip. Umbilicus a trifle less 

 open than that of A. chiricahuana. Aperture like that of A. chirica- 

 huana in shape, but in some specimens there is a low callous within the 

 outer lip, and one or two indistinct callouses within the basal margin, 

 while in others these are hardly noticeable. 



Alt. 9, diam. 17 mm., or slightlj'- smaller alt. 8.9, diam. 16.5 mm. 



Bear (Bearfoot or Barfoot) Park, Chiricahua Mountains, Cochise 

 county, Arizona. Types No. 88,885-6, A. N. S. P., collected by Mr. 

 J. H. Ferriss, 1904. 



Genitalia (PI. XXI, fig. 27) with a very short atrium. There is no 

 differentiated penis, the d^ organ being of equal calibre throughout, and 

 evidently an epiphallus. It terminates in the usual very short flagellum. 

 I can find no trace of a penial retractor muscle. The very long vagina 

 consists of a very slender lower portion and an excessively thick, muscidar 



